Appendix A _________________________________________________________ Modbus Reference
VAISALA ________________________________________________________________________ 67
Modbus Register Map
Table 22 Modbus Register Map
Address
(hexadecimal)
Format
Type
d/f
d/f
2
v
1 = online data
available
boolean
1 = purge in
progress, write
1 for manual
start
integer
247 allowed in
* Device specifications are valid only if purge functions are kept enabled. Do not modify registers 1283, 1284,
and 1285. Regular purge is needed to guarantee accurate measurements. Modify only if instructed to by Vaisala.
Actual address bytes used in a Mdbus Protocol data unit
Least significant word (bits 15 … 0)
Most significant word (bits 31 … 16)
Numeric value in range 0 … 65535
32 individual values, each 0 or 1
Floating point; IEEE 754 format
Register value cannot be changed with Modbus functions
Register value can be changed with Modbus functions
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